I understand replacement iOS devices come with a 90 day warranty. Say I buy a brand new iPhone 4, 1 year warranty, and it breaks on day 1 due to a fault. Apple replace it. Do I then have a 90 day warranty and that's it? Effectively I just spent £499 on a device and got a 91 day warranty, through no fault of my own? Am I missing something? I'm in the UK.